Siemens SENTRON 3VA2463-6JQ32-0AG0 — 630 A MCCB with ETU560
The Siemens SENTRON 3VA2463-6JQ32-0AG0 is a 3-pole molded case circuit breaker rated for a continuous current Iu of 630 A at 40 °C, with a rated insulation voltage of 800 V. It carries a 242 kA breaking capacity at 240 V, stepping down to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V — per the datasheet, the interrupting rating at each voltage level is a fixed value, not a conditional short-circuit current. The ETU560 electronic trip unit provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves, and the breaker includes a communication function for integration into higher-level monitoring systems. This MCCB is designed for line protection duty in main or feeder distribution panels. The 630 A frame covers large motor control centers, transformer secondaries, or busway feeds where selectivity with downstream breakers is required. The ETU560 release allows fine coordination: the short-time pickup and delay settings let you ride through inrush without nuisance tripping, while the ground-fault element (summation current formation on L-conductor) detects leakage without a separate core-balance CT. Physical dimensions are 248 mm height, 138 mm width, and 110 mm depth — a standard SENTRON 3VA frame size that fits existing Siemens switchboard cutouts and DIN-rail mounting plates. The auxiliary contact configuration is 1 auxiliary switch plus 1 trip alarm switch (HP type), and the breaker ships without an auxiliary release but includes an integrated auxiliary trip identified as 3VA9608-0BB11.
Thermal derating and power dissipation
The 630 A rating is at 40 °C ambient. Derate to 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. Maximum power loss at rated current is 162 W — this is the heat the breaker dumps into the enclosure, so panel ventilation or forced cooling must be sized accordingly. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C.
Coordination and selectivity notes
The ETU560 release supports LSI (long-time, short-time, instantaneous) protection plus ground fault. The short-time delay setting allows full selectivity with downstream 3VA breakers up to the short-time withstand rating. The 242 kA interrupting capacity at 240 V means this breaker can be installed at the service entrance where available fault current is high, without requiring current-limiting fuses upstream. The 15 000 mechanical endurance cycles (latching endurance) is typical for a 630 A frame in distribution duty — not intended for frequent switching, but adequate for infrequent maintenance operations.